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As someone who spends most of their dev time looking up math formulas, I second this motion!

I'd love to hear which ones you have to look up repeatedly over time, or ones that tend to be the most problematic.

The ones that pop into mind right now are...

Intersections:

  • line-line
  • line-circle

Rotating a vector (2D and 3D)

Projecting point to line and point to plane

Finding shortest angle between two vectors